Added basic styling.

css/02-input-textarea-label.css

@@ -0,0 +1,43 @@
+.fieldwrapper {
+    position: relative;
+}
+
+.fieldwrapper label {
+    position: absolute;
+    font-size: 1em;
+    left: 2ch;
+    padding: 0;
+    margin: 0;
+    color: #666;
+}
+
+.fieldwrapper input:focus ~ label,
+.fieldwrapper input:not(:placeholder-shown) ~ label,
+.fieldwrapper textarea:focus ~ label,
+.fieldwrapper textarea:not(:placeholder-shown) ~ label {
+    left: auto;
+    right: 1ch;
+    top: -.4em;
+    font-size: .8em;
+}
+
+input, textarea {
+    width: 100%;
+    border: none;
+}
+
+input:invalid, textarea:invalid {
+    box-shadow: 0 0 .2em #f00;
+}
+
+input:valid, textarea:valid {
+    box-shadow: 0 0 .2em #0f0;
+}
+
+input, img#captcha {
+    height: 2em;
+}
+
+textarea {
+    height: var(--textarea-height);
+}